<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .board{
            width: 400px;
            height: 400px;
            border: 3px solid #654321;
            border-radius: 5px;
            background-color: #deb887;

            /* 绘制横线和竖线 */
            background-image: linear-gradient(
                to bottom,
                transparent 39px,
                #654321 39px
                ),
                linear-gradient(
                to right,
                transparent 39px,
                #654321 39px
                );

            
            background-size: auto 40px,40px auto;

        }
    </style>
</head>
<body>
    <div class="board"></div>
</body>
</html>